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 June 22, 2015

How understanding GPS can help you hit a curveball

Curveball

Our brains track moving objects by applying one of the algorithms your phone’s GPS uses, according to researchers at the University of Rochester. This same algorithm also explains why we are fooled by several motion-related optical illusions, including the sudden “break” of baseball’s well known “curveball illusion.”

The new open-access study published in PNAS shows that our brains apply an algorithm, known as a Kalman filter, when tracking an object’s position. This algorithm helps the brain process less than perfect visual signals, such as when objects move to the periphery of our visual field where acuity is low.